Compared to other refrigerant pumps, the intelligent Grundfos RC pump reduces power consumption by as much as 32%. This makes an important difference to Danish Crown.
The company is the world’s largest exporter of pork and conscious of its responsibility for harmful effects on the environment.
The pump has been installed at Danish Crown’s facility in Herning, Denmark, where meat is frozen to a temperature of minus 30°C in the course of 24 to 48 hours. The Grundfos RC circulates ammonia around the facility’s refrigeration system to ensure the temperature stays at minus 40°C. The pump must be precise and reliable.
Morten Nyrup, who is responsible for operating the system, says the pump performs perfectly.
“It’s still keeping up even after our demand for cooling has grown, so it’s thumbs up from me,” says Morten Nyrup. “The pump actually exceeds our expectations when it comes to efficiency.”
Energy use is one of the main culprits of the climate’s greenhouse effect, which is why Danish Crown actively works to minimise its energy consumption. The company facilitates the development of technology, processes and logistics that can minimise the effect on the climate “from barn door to customer.”
Torben Andersen, Energy Manager with Danish Crown, is pleased with the company’s partnership with Grundfos.
“Danish Crown has energy-saving objectives, and Grundfos has a clear focus on exactly that,” he says. “That makes Grundfos a great partner for us, and they’ve proven how efficient their products are on many occasions. And they always make sure you’re provided with the right pump.”
"The pump actually exceeds our expectations when it comes to efficiency."
Morten Nyrup, system responsible, Danish Crown
Mikael Zacho Jensen, sales engineer with Grundfos in Denmark, says, “Whenever we can send a signal that we can help reduce CO2 emissions, it’s great for us to do that because our business should always build on sustainability. And we know very well that this is also very important to Danish Crown.”
Torben Andersen says, “We have a very good, on-going dialogue with Grundfos, and they take pride in innovative thinking. They’re always looking for how our technology can be improved. That’s why we’ve made our facilities available to Grundfos a number of times for them to have the opportunity to test new technology, and they’ve never stood in the way of our production.”
No wear parts
Mikael Zacho Jensen says, “The Grundfos RC is an incredibly robust pump with the lowest possible energy consumption, and it’ll work really well for many years. Contrary to traditional pumps, it has no wear parts, which saves time and money because you don’t have to shut it down to replace such parts, and very little maintenance is required.”
He adds that many people are surprised to learn that pumps consume 10 percent of global electrical energy production.
“But this means, of course, that pumps also have the potential to save great amounts of electrical energy,” says Mikael Zacho Jensen. “Pumps actually represent one of the most efficient opportunities to reduce CO2 emissions by means of existing technology. Most pump installations are needlessly inefficient, and Grundfos believes this must be changed.”
How the Grundfos RC differs from standard refrigerant pumps
The Grundfos RC refrigerant circulation pump installation at Danish Crown is equipped with a so-called intelligent bypass. The pump itself determines when the bypass must open and close. The pump motor is frequency-controlled, so that the pump continuously matches the flow of ammonia to the actual demand from the evaporators.
Danish Crown’s Morten Nyrup, who is responsible for operating the pump, says, “Our old pump had to be able to move liquid all the time, and the bypass was permanently open. It always operated at 50 Hz, but our new pump from Grundfos is frequency-regulated and can adapt to the variations in demand for liquid, which is why it saves a great deal of energy.”
Mikael Zacho Jensen, sales engineer with Grundfos, says that it was obvious that the Grundfos RC pump could save energy at Danish Crown.
“We decided to make use of our frequency converter, the CUE, combined with a differential pressure transmitter, and this made it possible to control the bypass intelligently,” says Mikael Zacho Jensen. “The RC will pump cold ammonia around the system according to the actual demand, which contrasts to the old pump, which was not regulated. And our RC pump is designed to just run and run. It has no wear parts and is incredibly robust compared to traditional pumps, where wear parts have to be replaced regularly.”
Energy Manager Torben Andersen, Danish Crown, is impressed with the 32 percent reduction of power consumption.
“That’s quite a lot when you look at it in isolation, and there’s actually a double saving because the power that’s used by the pump is transformed into heat,” Torben Andersen says. “If this didn’t happen, the refrigeration system would have to work harder to remove that heat. In addition, the RC pump has a very good design and is easy to service.”
Liquid CO2 – read the case
Read more about how the Grundfos RC refrigeration pump is optimised for the circulation of liquid CO2 in this case story from a Danish pasta factory.
Story by Morten Buchardt
Photos by Lars Mardahl